Properties of the Number 28987

Twenty-Eight Thousand Nine Hundred Eighty-Seven

Basics

Value: 28986 → 28987 → 28988

Parity: odd

Prime: No

Previous Prime: 28979

Next Prime: 29009

Digit Sum: 34

Digital Root: 7

Palindrome: No

Factorization: 7 × 41 × 101

Divisors: 1, 7, 41, 101, 287, 707, 4141, 28987

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

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Representations

Binary: 111000100111011

Octal: 70473

Duodecimal: 14937

Hexadecimal: 713b

Square: 840246169

Square Root: 170.25569006644096

Classification

Fibonacci: No

Bell Number: No

Factorial Number: No

Regular Number: No

Perfect Number: No

Special

Kaprekar Constant: No

Munchausen Constant: No

Armstrong Number: No

Kaprekar Number: No

Catalan Number: No

Vampire Number: No

Taxicab Number: No

Super Prime: No

Friedman Number: No

Fermat Number: No

Cullen Number: No

OEIS Sequences

Triangular array T(n,k), read by rows: coefficients of strong divisibility sequence of polynomials p(1,x) = 1, p(2,x) = 2 + 3·x, p(n,x) = u·p(n-1,x) + v·p(n-2,x) for n >= 3, where u = p(2,x), v = 1 - 2·x - x². A367297

a(n) is the number of symmetric domino towers with n bricks. A320314

Denominators of continued fraction convergents to sqrt(803). A42549

Nonnegative values·of solutions (x, y) to the Diophantine equation x²+(x+833)² = y². A129010

7 times heptagonal numbers: a(n) = 7·n*(5·n-3)/2. A152777

Quadruple lucky numbers (lower terms). Numbers n such that n, n+2, n+6, n+8 are all Lucky numbers. A139783

a(n) = A014284(n²) + A014284(n²-1). A361150

Repdigit - 1 is prime. A28987

Primes whose reversal is a cube. A57699